Water-tube boiler.



Patented Mar. I2, |901.Y E. R.' STETTINIUS.

WATER TUBE BILER.

(Application Med Ear. 7, 1900.)

3 Shaets-Shaet I.

Ati@

Y mmm! (No Modem Patented lar. 1 2, 19m.

E. 4n. .ssrlmus WATER TUBE BUILEB.

(Appumion md am. 7', 1900.

3 Sheets-Sheet 2.

(No Modem" Patented Mar. l2. |90I. E. R. STETTINIUS.

WATER TUBE BUILEB.

(Applicstion lsd Har. 7, 1900.)

3 Sheets-Smet 3.

(lo Model 02 f we MATTE-mi;

TH: Nonms PETERS oo, Puo-mutua, wAsHmomN, u4 c.

UNITED STATES PATENT 'EDWARD R. STETTINIUS, OF CHICAGO, ILLINOIS,ASSIGNOR rlO THE STIRLING COMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFIOATIONOI'mng part Of Letters 'ent N0. 669,774, dated March 12,1901. Application led March?, 1900. beral No. 7,643. (No model-l To allwhom, it may con/cern:

Bc it known that I, EDWARD R. STETTINIUs, a citizen of the UnitedStates, residing at Ohicago, in the county of Oook and Siate ofIllinois,have invented a new and useful Improve ment in Water-TubeBoilers, of which the following is a specification.

The object of my invention is to improve the veri ical water-tube boilerof the type commonly known as the Stirling boiler; and the inventionconsists in the features and combinations hereinafter described andclaimed.

In the accompanying drawings, Figure l is a cross-section of one form ofmy improved boiler-,one set of circulating-pipes being shown in dottedlines and outside the walls or setting and another set in full lines andinside the walls or setting; Fig. 2, a longitudinal sectional elevationof the boiler shown in Fig. l; Fig. 3, a cross-section of another formof my improved boiler, showing one set of circulating-pipes in dottedlines and outside the walls or setting and another set in full lines andinside the walls or setting; Fig. 4, a section in elevation of theboiler shown in Fig. 3; and Fig. 5, the same as Fig. 4, except that oneset of circulating-pipes is embedded in'thewalls or setting.

A, A', and A2 are elevated steamand water drums, ct pipes communicatingbetween the steam-spaces thereof, and a pipes communieating between thewater-spaces thereof; B, lower n1 ud-drums; O, banks of tubes connectingthe elevated steam and water drums with thelower mud-drums; D,circulating-pipes communicating between the rear elevated steam andvwater drum and the front lower mud-drum; D', circulating-pipescommunieating between the rear or middle elevated steam and water drumand the rear lower mud-drum; E, the fireplace, and e a re-brick archover the same, and F fire-brick partitions in the rear of and adjacentto the front and middle banks of tubes.

The Stirling type of boiler, to which my in* vention relates, is so wellknown that I do not consider it necessary to describe its constructionor operation in detail. In this view, and because they are clearly shownin the drawings, no description is considered necessary of the elevatedsteam and water drums and connecting-pipes, lower mud-drums, banks oftubes connecting the lower mud-drums with the elevated steam and waterdrums firebrick arches and partitions, and other features in common useas parts thereof. In addition to these parts or features, however, Iprovide one set of circulating pipes D between the rear elevated steamand water drum and the front lower mud-drum and another set ofcirculating-pipes D' between the rear or middle steam and water drum andthe rear mud-drum. As shown, the pipes of the first set are outside thewalls or setting or embedded therein, and the pipes communicate with theends of the drums to which they are attached, respectively; but theirconnections are not necessarily at the eXtreme ends of the drums,connection near the ends being sufficient. Any number of these pipes maybe used as desired, depending somewhat upon their size or diameter; butgenerally one at each end will be found sufcient, and sometimes a singlepipe at one end only. As shown, the pipes of the second Set are insidethe walls or setting and they connect through the shell of the drums towhich they are at.- tached, respectively. Any number ofthese pipes maybe used desired, and they may be placed in any desired position.

In filling, feed-water being introduced into the rear mud-drum passes upthrough the rear bank of tubes and the circulating-pipes D' into therear steam and water drum in the form of boiler shown in Fig. l and intothe rear and middle steam and water drum in the form shown in Fig. 3,and from the rear Steam and water d rum it passes down through thecirculating-pipes D to the front mud-drum and thence up through thefront bank of tubes to the front elevated steam and water drum in theform of boiler shown in Fig. l, and up through the front and middlebanks of tubes to the front and middle steam and Water drums in the formshown in Fig. 3, and also from the rear steam and water drum in the formof boiler shown in Fig. 1, and from the middle steam and water drum, inthe form shown in Fig. 3 through the connecting-pipes to the front steamand water drum. In operation, the front bank of tubes being in thehottest part of the boiler, the most rapid up- IOO ward circulation willbe through this bank; but the circulating-pipes D permit a constantdownflow and supply of Water to take the place of Water converted intosteam in this bank of tubes, and also the place of Water passing fromthe front steam and water drum into the lrear or middle steam and waterdrum or elsewhere. The water-spaces of the front and rear steam andwater drums or front and middle drums, as the case may b e,communicating with each other, Water passes from one of `these drums tothe other, as required by circulation and other conditions. In otherwords, the circulating and connecting pipes provide for a powerfulcirculation of water up through the front bank of tubes and across fromthe front steam and water drum to the rear or middle steam and waterdrum, as the case may be, and down to the front mud-drum, and so on incircuit, the practical effect being that the tubes of the front bank aremore completely filled with cooler water or water free from steam andthe transmission of heatin this bank therebygreatly increased. Inaddition to this primary circulation the water also flows from the rearor middle steam and water drum, as the case may be, back and downthrough the circulating-pipes D to the rear mud-drum and up through therear bank of tubes to the rear steam and water drum, and so on incircuit. This latter circulation serves to heat the feed water moreuniformly and provides for a more complete separation and settlement ofscale-forming matter in the rear and cooler parts of the boiler. If feedwater be introduced in the rear or middle steam and water drum orelsewhere in the rear part of the boiler, the circulations will bepractically unchanged. The circulating pipes being of larger diameterthan the diameter of the tubes of the several banks and being located ina relatively cool part of the boiler provide for a constant andVabundant supply of water from the rear part ofthe boiler to the frontpart, and this without having serious counter-currents in the tubesfurnishing the heating-surface and primarilyintended for the generationof steam.

I claim- A l. In a water-tube boiler, the combination of a plurality ofelevated steam and water drums, pipes communicating between thesteam-spaces of said drums, pipes communieating between the Water-spacesofthe front steam and water drum and the steam and water drum adjacentthereto, a front lower mud-drum, a rear lower mud-drum, a bank of tubesconnecting'the rear mud-drum with the rear steam and Water drum, a bankor banks of tubes connecting the front muddrum with the steam and waterdrum or drums having their Water-spaces in communication, a circulatingpipe or pipes at the ends of and communicating between the rear steamand water drum and the front muddrum, located in cool relation to theboilersetting and giving an auxiliary circulation at the end between thetwo drums, a circulating pipe or pipes connecting the rear one of thesteam and water drums having their waterspaces in communication with therear muddrum, means for introducing feed-water, and means for drawingoff steam, substantially as described.

2. In a water-tube boiler, the combination of a plurality of elevatedsteam and water drums, pipes communicating between the steam-spaces ofsaid drums, pipes communieating between the water-spaces of the frontsteam and water drum and the steam and water drum adjacent thereto, afront lower mud-drum, a rear lower mud-drum, a bank of tubes connectingthe rear mud-drum with the rear steam and water drum, a bank or banks oftubes connecting the front muddrum with the steam and Water drum ordrums having their water-spaces in communication, a circulating pipe orpipes communicating between the rear steam and water drum and the frontmud-drum embedded in the walls or setting, a circulating pipe or pipesconnecting the rear one of the steam and water drums having theirWater-spaces in communication with the rear mud-drum placed inside theWalls or setting, means for introducing feed-Water, and means fordrawing off steam, substantially as described.

EDWARD R. STETTINIUS.

Witnesses:

F. ARMBRUSTER, H. C. CRANZ.

